[OSM-talk] Turn restrictions

80n 80n80n at gmail.com
Thu Aug 16 08:28:50 BST 2007


I like the fact that this proposal is simple enough to be understood by the
man in the street (sorry about that pun).

Sometimes streets do not have an identifiable name, especially some of those
funny connecting roads at complex junctions.  How can this be handled?  Make
up our own name?  name:osm="Baker Street to eastbound Westway link" perhaps.


On 8/15/07, Steve Coast <steve at asklater.com> wrote:
>
> So I'm on a train otherwise I'd link to Andys wiki page he pointed to
> today, but I want to try out a turn restrictions scheme,
>
> Given a road direction, and roads 'Baker Street' and 'Marylebone
> Road' you tag the way 'Baker Street' with
>
> no_turn_left:'Marylebone Road'
>
> If you can't turn right then it's 'no_turn_right'. If you can't turn
> at all it's 'no_turn'. And thats it. There are three major problems
> with this
>
> First, as far as I know JOSM doesn't let you use keys more than once
> but the API does. So you can't have more than one no_turn_left. So
> fix JOSM.
>
> Second, what if it's no turn for car but ok for bikes, or whatever.
> Well, then shouldn't we look at triple tags?
> car:no_turn_left:Marylebone Road ? That is, keyvals now have third
> string along with key and val? We'd add a third keyval property, call
> it what you will, and all the current keyvals will have that third
> proprty set to 'general'. So general:name:Foo Street and so on. Then,
> this third column can be specialised along the lines of Map Features
> as the keys and vals are.
>
> Third, what if someone misspells 'Marylebone Road' or the road isn't
> joined, or it doesn't exist or something. Well, people will enter bad
> data ON PURPOSE and our map data will never be perfect ANYWAY. And,
> it's a wiki so you can fix it. And, it's incredibly simple compared
> with any competing scheme I've seen. Also, JOSM (or potlatch) can
> prompt you and say 'ah-ha Mr. Mapper, that looks wrong!' And you can
> read it, but you can't read bigscheme:way:324543525234:no_turn:34523452.
>
> have fun,
>
> SteveC | steve at asklater.com | http://www.asklater.com/steve/
>
>
>
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